The two states of CYG X-1 and related sources

Details The two states of CYG X-1 and related sources The two states of CYG X-1 and related sources

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...166l..19k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 166, no. 1-2, Sept. 1986, p. L19-L22.

Astronomy and Astrophysics

Astronomy

11

Black Holes (Astronomy), Galactic Nuclei, X Ray Binaries, Active Galactic Nuclei, Electron Plasma, Electron-Positron Pairs, Pair Production, Positrons, Stellar Mass Accretion, X Ray Spectra

Scientific paper

A model for active galactic nuclei (Kazanas and Ellison 1986) employing quasi spherical accretion onto a black hole, when scaled down to solar mass objects, provides a straightforward account of the bimodal spectral behaviour of Cyg X-1 and the other galactic black hole candidates. It is argued that the change in the spectrum is due to the drastic increase of the source compactness (L/R) with the accretion rate mand the subsequent conversion of most of the energy released by accretion into e+ e- pairs. It is also argued that similar changes may be observed in active galactic nuclei.

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